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Modelling the spectrum of Mg in cool stars
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Theoretical Astrophysics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2014 (English)In: XXII International Conference on Spectral Line Shapes (ICSLS 2014), 2014, 012001- p., 012001Conference paper (Refereed)
Abstract [en]

The astrophysical importance of Mg, together with its unique range of spectral features in late-type stars, plus its relative simplicity from an atomic physics point of view, makes it a prime target and test bed for detailed ab initio non-local thermodynamic equilibrium (NLTE) modelling in stellar atmospheres. In this paper, we present example first results for calculations of NLTE Mg line based on a new model atom with significant improvements in the collision data for neutral Mg. We perform calculations for excitation of the lower-lying levels due to electron impacts using the R-matrix method. Recent data for excitation and charge transfer due to hydrogen atom impacts involving low-lying levels are now employed. Further, we have made efforts to use physically-motivated methods for calculating radiative and collisional data involving Rydberg states. The results are compared with observed spectra and the impact of the new calculations briefly explored.

Place, publisher, year, edition, pages
2014. 012001- p., 012001
, Journal of Physics Conference Series, ISSN 1742-6588 ; 548
National Category
Physical Sciences
URN: urn:nbn:se:uu:diva-246758DOI: 10.1088/1742-6596/548/1/012001ISI: 000346654400001OAI: oai:DiVA.org:uu-246758DiVA: diva2:794052
22nd International Conference on Spectral Line Shapes (ICSLS), JUN 01-06, 2014, Tullahoma, TN
Available from: 2015-03-10 Created: 2015-03-10 Last updated: 2015-03-10Bibliographically approved

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Barklem, Paul S.Osorio, Yeisson Fabian Martinez
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Theoretical AstrophysicsDepartment of Physics and Astronomy
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